Machine for testing the component parts of the injection systems of compression-ignition engines



Feb. 24, 1953 1.. HARTRIDGE I 2,629,255

MACHINE FOR TESTING THE COMPONENT PARTS OF THE INJECTION 1 SYSTEMS 0F COMPRESSIONIGNITION ENGINES Filed June 30, 1948 7 Sheets-Sheet 1 Inventor j} Zc e /-/arZ/'zcKg 3 Attbrney Feb. 24, 1953 L. HARTRIDGE 2,629,255

CTION 7 Sheets-Sheet 2 MACHINE FOR TESTING THE COMPONENT PARTS OF THE INJE -IGNITION ENGINES SYSTEMS OF COMPRESSION Filed June 30, 1948 F/GZ.

lnvehtor Attorney Feb. 24, 1953 HARTRIDGE 1 2,629,255

MACHINE FOR TESTING TH E COMPONENT PARTS OF THE INJECTION SYSTEMS 0F COMPRESSION-IGNITION ENGINES Filed June 30, 1948 I 7 Sheets-Sheet 3 Attorney Feb. 24, 1953 L HARTRIDGE 2,629,255

MACHINE FOR TESTING THE COMPONENT PARTS OF THE INJECTION SYSTEMS 0F COMPRESSION-IGNITION ENGINES Filed June 30, 1948 7 Sheets-$heet 4 fig Attorney Feb. 24, 1953 E 2,629,255 MACHINE FOR TESTING THE COMPONENT PARTS OF THE INJE Filed June 30, 1948 SYSTEMS OF COMPRESSION-IGNITION ENGINES I I I IIIIIIIAIII/II III/A L. HARTRIDG CTION 7 Sheets-Sheet 5 I l l I l l i I nventor zwe fi alzmag Attorney Feb. 24, 1953 RIDGE 2,629,255

' IL. HART MACHINE FOR TESTING THE COMPONENT PARTS ORV-THE INJECTION SYSTEMS 0F COMPRESSION-IGNITION ENGINES Filed June 30, 1948 7 Sheets-Sheet 6 l 9/ 93 1/0 I 9 10s 5 1/2 I04 loo Inventor A Homey Feb. 24, 1953 HARTRIDGE 2,629,255

MACHINE FOR TESTING THE COMPONENT PARTS OF THE INJECTION RESSION-IGNITION ENGINES v SYSTEMS 0F COMP Filed June 30, 1948 7 Sheets-Sheet '7 F 6. IO.

nvenior Attorney Patented Feb. 24, 1953 MACHINE FOR TESTING THE COMPONENT PARTS OF THE INJECTION SYSTEMS OF 1 COMPRESSION-IGNITION ENGINES Leslie Hartridge, Buckingham, England Application June 30,1948, Serial No. 36,008

In Great Britain February 20, 1947 14 Claims.

This invention relates to. a machine for testing the componentsof compression-ignition engines as to their behaviour underpressure, more particularly, for testing nozzles as to spray formation, nozzle opening pressures, .dry seat, and pressure drop. i

One object of theinvention isthe provision of a testing machine wherein test conditions .are uniform and constant-as distinct, for example, from known machines comprising a hand-lever operated fuel feed pump for an injector under test. In the knowninachines movement of the hand lever is of necessity jerky and the rate at which pressure is applied to the pump varies as the said rate depends largely on the force which the operator exerts on the handlever.

.A further object of the invention is the provision of a machine which will conform to a standard as to the-rate (times per minute, for example) at which the injector is operated and to duration of injection.

According to the invention there is rovided a machineQior testing ,the injectors or nozzles of compressionignition engines, comprising a camoperated liquid feed pump, adapted to be connected to an injector tobe tested, associated with means (e. g., a flywheel or a constant-speed electric motor) arranged to drive the cam at a steady speedofjrotation, the machine being arranged to hold the nozzle so that spray is visible when issuing therefrom. H

The surfaceof the cam lobe which effects reciprocation of the pump plunger preferably subtends an angle of from 90 to110 at the centre of rotation of the cam and the said means preferably drives the cam at a steady speed lying betWeenBO and 90 R. P. M. In a typical case the subtended angle is approximately 100 and the rate of rotation about 85 R. P. M. A cam with such a profile and driven at such a speed will produce an injection operation on a standard pump substantially equivalent to the injection operation of the pump when driven by a standard enginecam at about 25 R. P. M. Effectively, the result in the case of 85 injections per minute will be equivalent to using the standard fuel pump cam of a small are driven at 25 R. P. M., owing to the deletion of the time lag (when the pump is not? pumping. 'A further advantage of the larger arc is that it produces a steadier build-up of pressure, which isa more advantageous condition for the tests of the injection. A further advantage is, that by thegreater numberof injections per minute, inspection, of'the formation ofthe sprayetc, is materially assisted." Itis also an advantage that the larger cam profile can be more accurately manufactured due to its larger operating area.

Inorder to enable a dry seat test to be car ried out an hydraulic accumulator or pressure chamber and a pressure gauge may be incorpo-:

rated either in the-hand driven machine or in the power driven ,machine'anda suitable valve ,or

, accumulator the said pressure is held (for the purpose of the test) whether or not there is leakage at the nozzle seat or elsewhere. Leakage or bleeding, if present, at -:the nozzle seat will become apparent by the formation of a globule or liquid beadat the injectororifice.

A power-operated machine and a hand operated machine will now be described with'reference. to the accompanying drawings wherein ,Fig. 1 is a front elevation of a power-operated machine with parts broken away and parts in section to expose details;

Fig. -2 is an end elevation of the machinefrom the left thereof, parts being broken away;

Fig. 3 is an end elevation of the machine from the right thereof, parts being broken away;

Fig. 4 is a planview the plane indicated by the line IV,IV, Fig. 1;

Fig. 5 isa diagram of the pipe connections of the said machine;

Figgfi is a detail showing how a multi-hole nozzle can be tested in the machine (Figs 1 and 2 showing a single hole injector under test) Fig. 7 is a front elevation of' a hand operated machine with a part broken away to expose details;

Fig. 8 is aloft-hand end elevation of the machine shown in Fig. 7, a part of the case being broken away; i

i Fig. 9 is a right-hand machine; and j a Fig. 10 is a detail showing how a multi-hoie injector may be tested verticallyas distinct from the horizontally tested, single-hole injector showninFigs. '7, 8 and 9. fl

, The machine shown in Figs. 1. to 4 comprises a :rectangular case I formed by angle uprights 2,.

stretchers 3 and sheet metal plates 4.

end elevation of the said A platform 5 at about the centre horizontal plane of this structure, said platform resting on the middle stretchers 3, carries. a constant speed electric motor 6 adapted to drive a cam 1 through reduction gearing enclosed in a box 8 in known manner. The cam reciprocates the plunger 9 of a pump III, the pump, being mounted on the box I I enclosing the cam and bearing the foot of the plunger, and the said box I I being rigid with gear box 8. Hence, the platform supports the pump, the cam box and reduction gearing as well as the motor. The platform also carries an exhauster I2 driven by an extension I3 on the shaft of, the motor.

The cam has a profile I4 the operative run of which i. e., the portion which lifts the pump plunger and allows it to fall, subtends an angle. of from 90 to 110 at the centre of .rotation of the cam.

The platform 5 is located towards one end of the middle stretchers; a waste tank 45, the function of which will be described, is'supported from the middle stretchers and has its mouth, which is covered by filter gauze' I3, between the left hand end of the case and the left hand endof the platform.

A top 'plate I1 directly or indirectly supports the majority of the remaining components of the machine. That is to say, the top plate supports a liquid tank I8, a pressure gauge I9, a filter and pressure accumulator and 2|, respectively, these components being at the right hand 'endof the top plate, a column 22 adjustably s pporting a bracket 23 adapted to carry the nozzle 24' to be tested, and a spray receptacle and liquid extractor generally indicated by 25.

The fuel'tank I8 is at the top of a hollow casting 26 attached to the top plate in any suitable manner;-"th'is casting lies'towards the rear. The front edges of the flanks of the casting are inclined; these have the mounting plate 21, of the pressure gaugefixed to them. The top plate is Qpenbeneath the liquid-tank; the upper part of thefilt'erifl enters the hollow of the casting towards the right, hand'side thereof and the bottom thereofenters the'case above; the motor. Studs as "28 passing through "fixing lugs as 29 on the case "of the filter 20 andengaging the top plate hoId'Jthe filter in position. The pressure accumulator 2"| lies beneath the tank to one side of the filter .20; it is fixed to the top plate I1 'by' studs and lugs, not shown, comparable with the studs and lugs29, respectively.

Inthe lefthand half of the top plate is a circular opening '30 defined by a raised lip 3|. The spray receptac'leand liquid extractor are suspended from this lip whilst a funnel rim or ring 32 ofincreasing diameter towards its base removably. rests on the lip 33 of thetop element 34 of the assembly 25. This element is hollow, of inverted, frusto-conical or funnel form and has anexternal flange 35 at its largest diameter which rests .on the lip 3|. A secondhollow element, 36, of inverted frusto-conica1 or funnel form lies beneath the element 34; its top receives the lower end 34a of the element 34 in-spaced relation to its sides and its bottom is of elbow form 31'. A suspension rod 38 depending from a bridge 39 resting in recesses in the tops .oflugs 40, whichlugs are diametrically opposite each other inzthebottom oi the element 34, secures the element 36 to the element 34, the bottom of the element 36Lhaving'an inwardlydirected flange 42 which butts against a compressible sealing ring 43 at the bottom of an annular swelling 44 on the element 34. Within the element 34 is a hollow, frusto-cone 45. The base does not reach the inner surface of the element 34; it rests on lugs 46 cast in this element. A drain-off 41 which lies over the filter gauze I6 is located at the bottom of the elbow 31.

It will be seen that the lip 33 of the element 34 is stepped; an annular flange 48 on the rim or ring 32 lies within the step. This arrangement locates the ring but does not hinder its removal and replacement.

The column 22 upstands from the top plate-to the rear of the lip 33. The bracket 23, slidable on the column, can be set at any desired height thereon andreleasably fixed by a screw 49. This bracket removably carries the nozzle 24 co-axially of the assembly 25, said bracket having a thumb nut 23a for securing the nozzle in position.

A second elbow 50, joined to the elbow 31, connects the elbow 31 to the exhauster intake 5|. The exhauster delivery is indicatedat 52, Fig.1; it willbe seen that it opens to the tank I5. Air from the exhauster, therefore, enters the tank and then leaves it through the gauze 16, said air being filtered thereby before it escapes to the interior of the case and thence to atmosphere. This function of the gauze is additional to its filteringfunction on liquid which drips from the drain-off 41 and enters the tank, as will be described.

Liquid flows from the tank I3 to the liquid filter 23 by way of a pipe 53, flows from the filter to the pump by way of a pipe 56 and flows from the pump to a first control valve 55 by way of a nipple 53. The liquid flows to the injector 24', whether the valve be opened or closed, through a pipe 51. having a flexible run 51a, the valve being of the known type which always has one of two passages open but can be operated to open or .to close the second passage. The second passage isconnected to a two-way valve .58 of the known type by means of a pipe 53, which valve can be operated to close b'oth outflow passages or to open the first and close the second. The first passage'of the second valve is connected to the. pressure gauge by the pipe 63 and the second passage of the said valve is connected to the pressure accumulator by a nipple 6|, the nipple securing the valve to the pressure accumulator.

The pressure accumulator is a chamber or box filled with liquid save for a cushion of air which is compressed at the top of the liquid.

A pump-output control rack 62 operated in conjunction with a scale 33is provided on the pump, said rack being operated by a rod 6-! accessible from the right'hand end of the case I and sup-. ported by a guide 3,5 on the case. It will be seen that the rod bears the scale and the guide carries the datum line. The rod-operated rack control for the pump is substantially comparable with the known control for the pumps of compression ignition engines, the pump being of substantially standard type.

When a test is to be made the injector, as 24, to be tested is applied to the bracket 23 and the motor is started. This causes the pump to force liquid through the injector nozzle and causes the exhauster tosuck air through the mouth of the ring 32. If thespray jetspreads over the lip 32a.

sistent with all the spray entering the ring, in order to expose as much of the spray as possible to View. If the injector be of multi-hole type, as indicated at 240, Fig. 6, the bracket will be positioned on the column 26 to locate the discharge end of the injector within the ring as shown in this figure.

For spray tests the valve 55 will be set by means of its operating handle 55a, which is accessible from the right hand end of the machine, to prevent liquid from flowing to the valve 58, whilst the valve 58, by means of its handle 58a adjacent to the handle 55a, will be fully closed. Atomised liquid, by the actionof gravity and by the current of air sucked into the assembly 25 through the mouth of the ring by the exhauster,

will condense n the walls of the elements, 36v

and 45 (and the wall of the element 32 if the nozzle is of the type shown in Fig. 6) and will flow through the drain-off 41 into the tank l5, said liquid gravitating down the inner surfaces of the elements and readily dripping off the upper elements and 45 because the bottoms of these elements have sharp edges 66. The top thebridge 39 is of knife-edge form to'assist the flowing-off therefromof collected liquid; The

sealing ring 43 and the elements 42 and forming a joint therewith prevents the inflow of air at the joint. Air passing through the assembly 25 and thence to the exhauster will, ofcourse,

be liquid-laden. A good deal of the liquid will be j deposited on the surfaces ofthe elements 34, 35 l and 45, the element 45 preventing the main body of air from passing through the assembly without sweeping a condensing surface, whilst the hauster delivery communicates with the tank.

Liquid collected in the tank can be drawnoff as necessary through the cock la.

For some typesof, nozzles the ring 32 will not be required; it is easily removable for this reason, the flange 48 loosely entering the mouth of the cone .34.. The mouth ofthe ring 32 is large enough to ensure that inflowing air does not materially alter the shape of the spray.

If it be desired to refer to the pressure gauge 19 in thesprayteststhe valves 55 and 58 are operated to enable liquid under pressure from the pump to effect the gauge.

'For dry seat tests the valves 55 and 58 are operated to include both the pressure gauge and theaccumulator 2!. Once pressure is built up in the said accumulator to "the point immediately preceding nozzle operation, as indicated by the gauge, the motoris stopped; The rate at which the gauge pressure drops is an indication A suitable speed for the cam during the above described tests is 85 R. P. M. because, having regard to the comparatively large arc of the profile M, the operative period of the. profile during each revolution is approximately equivalent to the length of time of injection operation of a standard pump cam which has a much smaller are driven at a much lower speed, say 2 R. P. M.

The hand-operated machine will now be described with reference to Figs. 7 to 10.

The machine comprises a case 10 formed by a-frame H and, in the main, sheet metal panels 12. A platform '13 at the right hand side of comparable with the feed pump used in standard,hand-operatedtesting apparatus, and the of the degree of tightnessof the nozzle seat. If

the nozzle seat becomes wet this is shown by the formation of a liquid globue thereat.

For a pressure drop test, that is to say, a test determining the ability of an injector to hold the pressure of liquidin it and in the feed pipe to it, pressure is builtup in the accumulator 2| as in a dry seat test, the pressure being 1ndicated by the gauge, but then the valve 58 is operated to out the accumulator out. The test commences at this instant; any pressure drop 1 owing to injector leakage will be indicated by thegauge. uisite; time, say

ten seconds the injector passes thetest.

If the pressure is held for the reqbearings for a cam shaft 16. The shaft bears a cam, '1 similar to the cam I shown in Figs. 1 and 3 and has a flywheel H at its right hand endjsaid flywheel being provided with a driving handle 18 'The mass and diameter of the flywheel issuch that a, rate of P. M. is attained by the"flywh'ee1 when it is turned at an easy normal speed. A typical flywheel weighs 601bs. and has a diameter of 12.5 inches.

The'cam when rotated-depresses the usual, spring-returned handlever 19 of the pump and, therefore, operates-the pump.

The pump receives liquid from a liquid supply tank '80, incorporating a filter, and delivers it to a valve 8! which is mounted on the pump by the connecting nipple 82. The connecting pipe between the tank and the pump is indicated by The valve is of two-way'type; one of its passages which is always open, is connected to a pipe 84 and the other passage, which may be opened or closed at will by means of the handle Bic, is connected to a pressure gauge 85. A coupling 86 provides the said connection. The coupling 86 issecured to a bracket 8'! which, in turn, is secured to a fixing bracket 88 rigidly upstanding from the pump case. The

brackets .81 and 88 support the pressure gauge,

and therefore by means of a column 89 on the bracket 81, support the member 80, said member, being secured to the column by a bolt 90 passing through a lug 80a on the said member.

The case extends above the platform 13 at the left hand end thereof; the top of the extending part has a horizontal panel 9| at its rear and a hood 92 at its front, said hood being hinged to the panel 9| at 93 and comprising transparent plastic or the like.

The panel 9i and a narrow horizontal panel 94 immediately beneath the opening 95 which the hood normally closes, are provided with holes 96 and 91, respectively, for the application to the machine of a nozzle to be tested. The pipe 84 enables the valve 8i to be connected to an injector, such as the injector 24, when mounted in the hole 91. The coupling 98 between the valve and this pipe is of readily detachable type to enable the substitution for the pipe 84 of a pipe 99 (Fig. 10) suitable for connecting the valve to an injector when mounted in the hole 96.

Immediately beneath the panel 94 is a housing I00 for lamps IOLsaid housing being glazed at I92 to enable light from the lamp to pass to the. chamber I93 formed by the interior of the case 10 but to prevent. spray in the interior from entering the housing.

Within the chamber lll3is a hinged home. This j co'r'nprises acrosspartition l'lll'releasably caught a i s to by ooks r "i a the r t of h panel 91, and -a cross partition lllfiihinged at its front to lugs it] at the bottom of the lamp hous ing. The lower end of the partition I04 is hinged to the rear end ofthe partition I96 by links l8; and the dimensions of the partitions are such that when the latter are in thetull line position shown in Fig. 8 the partitions incline downwardly and rearwardly, as shown. The partitions may be lowered to the dotted line positon shown in Big. 8 following unhooking of the panel lfl Lthe links its permitting the partitions to f old together. A stop we fixed to a side of the case provides a rest for the folded partitions.v

' When the partitions are in the full line position theydivide the chamber I63 into compartments I H) and H I. Spray from the injector shown in Fig. 8 can be observed in thecompartmerit l throughthe hood 92. Thespray passes to the compartment IH through ahole li2in the partition and finally condenses. The condensate may be collected by any suitable means at the baseof the chamber I03. An, air vent I I3 is providedat the Lbaclr of the chamber.

The object in providing the partitions is, as, will be evident, to'trap clouds of spray the compartment ill soas to isolate Lthem fro'mlthe zone in which the spray from the injectorfis to be observed, the hole H2 beingco-arial with the hole 9? for the nozzle.

For a simple spray inspectiontest the valve 8| is operatedto prevent liquid pressure from effect:- ing the pressure gauge. For a dryseat test the valve is operated to allow liquid pressure to operate the gauge; the, flywheel' is turned .until, the pressurefindicated by the, gauge is just below the pressure at which the injector is set to sprayv and the injector nozzle is examinedfor bleeding. The hoods? enables access to be gained to the nozzle so that itmay be wiped for this test.

If the nozzle is of ,multi -hole type (Ma, Fig' 10) the partitions H14 and 1.06 are lowered to-tlie dotted line position, shown in Fig.v 8 and the nozzle is fitted to the hole .96 and connected to the valve 3!, seeFig 1,0. Itwill be evident that the hinged hood can beraised to give access to the chamber L93 during nozzle fittingland removal and during the tests, and to give. access. to the partitions. I

WhatI claimis:

l. Ainiachine for testing injectors or nozzles for compression ignition engines, comprising a liquid feed pump, a cam for operating the pump, means for driving the carnat' a steady speed of rotation, a support for holding an'injector to be tested to expose to view the spray that issues from the injector, means for connecting said pump to the injector helduby said suppo1 t,.a.receptacle for the reception of the spray from the injector undergoing. test; an exhauster and means for driving same, said receptacle including a substantially vertical funnel positioned relative: to said support. toreceive at' the wider end thereof the spray from the injector that is held bysaid support, andalconnection, between the intake of l saidexhausterand'the narrowend of said funnel. r

2., A machine ,for testing injectors.or nozzles for compression ignition engines, comprising .a liquid feed pump, a cam, for operating the. pump, means for driving, the cam. are steadyv speed of rotation, a support for holding. an injector to be tested to expose to view the ,spraythatissus from the injector, .means for connectingffsaid im i t e-iniesi clie l ,b se eis e tas I ceptacle for the reception of thespray from the cepta le fer h ec o of e S a r m the. injector undergoing test, an exhauster, said. receptacle including a first upright funnel and a second upright funnel, said first funnel being positioned relative to said support to receive at the wider end thereof the spray from the injector that is held by said support, the narrow end of said first funnel dipping into the mouth of said second funnel, a substantially horizontal ring located in said first funnel in spaced relation to the inner surface of said first funnel, the extremity of said narrow end having a sharp edge and the bottom of said ring having a sharpedge, and a connection between the intake of said exhauster and the narrow endof said second funnel.

3'. "A machine for testing injectors or nozzles for compression ignition engines, comprising a liquid feed pump, a cam for operating the pump, means for driving th cam at a steady speed of rotation, a support for holding an injector to be tested to expose to view the spray that issues from the injector, means for connectingsaid pump to the injector held by said support, areceptacle tor the reception of the spray fromthe injector undergoing test, an exhauster, said, receptacle includin a firstuprig-ht funnel and a second upright funnel, said first funnel being positioned relative to said supportlto receive'a't the wider end thereof the spray from the injector that is held by said support, the narrow end. of said first funnel dipping into the mouth of said second funnel, a substantially horizontal ring located in said first funnel in spaced relation to the inner surface of said. first funnel, a sealing joint between said first funnel and said second funnel, the extremity of said narrow end having a sharpvedge and the bottom of said ring having a'sharp edge, and a connection between the in:- take of said exhauster and the narrowend of said second funnel.

14. A machine for testing injectors or nozzles for compression ignition engines, comprising a liquid feed pump, a cam for operating the pump, means for driving the cam at a steady speed of rotation, a support for holding an injector to be tested to expose to view thesprayrthat issues from the injector, means for connecting said pump to the injector held byvsaid support, are? ceptacle for the reception of the spray from the injector undergoing test, an air exhauster and means for driving same, a. waste tank, aconnection between said receptacle and the intake of said air exhauster to draw air and spray liquid through said receptacle, and a connection between said waste tank and the delivery ofrsai'd exhauster, said last mentioned connection opening to said waste tank at the top thereof.

,5. Amachine for testing injectors or nozzles for compression ignition engines, comprising a liquid feed pump, a cam for operating the pump, means for driving the cam at a steady speed of rotation, a support for holding an injector to be tested to expose toview the spray that. issues from the injector, means for connecting said pump :to the injector held by said support, a' reinjector undergoing test, said receptacle comprising walls defininga chamber, a partition member, said partition member dividin said chamber into two spray compartments, a transparent window for one compartment, said injector support being positioned for supporting the. injector to deliver spray into said, compartment, having said transparent window, said partition member having an 7 opening, said opening'being located to permitbf 9, the passage of said spray therethrough into the other compartment whereby said partition isolates the spray passing into said other compartment from returning or drifting back into the one compartment, said opening being of a size at least as large as the cross-section of the projected spray and said other compartment being of a size to accept the spray.

6. A machine for testing injectors or nozzles for compression ignition engines, comprising a liquid feed pump, a cam for operating the pump, means for driving the cam at a steady speed of rotation, a support for holding an injector to be tested to expose to view the spray that issues from the injector, means for; connectingjsaid pump to the injector held by said support, a receptacle for the reception of the spray from the injector undergoing test, said receptacle comprising walls defining a chamber, a partition member, said partition member dividing said chamber into two spray compartments, a" transparent window for onecompartment, said injector supportbeing positioned for supporting the injector to deliver spray into said compartment having said transparent window, said partition member having an opening;said opening being located to permit of the passage of said spray therethrough into the other compartment whereby said partition isolates the spray passing into said other compartment from returning or drifting back into the one compartment, said opening being of a size at least as large as the cross-section of the projected spray and said other compartment being of a size to accept the spray and means for illuminating said compartment having said transparent closure member.

7. A machine for testing injectors or nozzles for compression ignition engines, comprising a liquid feed pump, a cam for operating the pump, means for driving the cam at a steady speed of rotation, a support for holding an injector to be tested to expose to view the spray that issues from the injector, means for connecting said pump to the injector held by said support, a receptacle for the reception of the spray from the injector undergoing test, said receptacle comprising walls defining a chamber, a partition member, said partition member dividing said chamber into two compartments, a transparent window for one compartment, said injector support being positioned for supporting the injector to deliver spray into said compartment having said transparent window, said partition member having an opening, said opening being located to permit of the passage of said spray therethrough, and said partition member comprising a plurality of sections, means for collapsing said sections, means in said machine for supporting the collapsed sections in an out-of-the-way position whereby said chamber is unpartitioned.

8. A machine for testing injectors or nozzles for compression ignition engines, comprising a liquid feed pump, a cam for operating the pump, means for driving the cam at a steady speed of rotation, a support for holding an injector to be tested to expose to view the spray that issues from the injector, means for connecting said pump to the injector held by said support, a receptacle for the reception of the spray from the injector undergoing test, said means for driving the cam at a steady speed of rotation comprising a constant speed electric motor, an air exhauster, a drive transmission between said motor and said ceptacle and the intake of said air exhauster to draw air and'spray liquid through said receptacle. 9. A machine for testing injectors 0r nozzles for compression ignition engines, comprising a liquid feed pump, a cam for operating the pump, means for driving the cam at a, steady speed of rotation, a support for holding an injector to be tested to expose to view the spray that issues from the injector, means for connecting said pump tothe injector held by said support, a receptacle for the reception of the spray from the injector undergoing test, said receptacle having its mouth at its top, a removable rim for said receptacle and positioned relative to said support to receive the spray from the injector that is held by said support, said rimbeing wider at its bottom than at" its top, said bottom fitting said mouth.

1 10. A machine fortesting injectors or nozzles for compression ignition engines, comprising a liquid feed pump, a cam for operating the pump, means for driving the cam at a steady speed of rotati'oma support forholding an injector to be tested to expose to view the spray that issues from the injector, means for connecting said pump to the injector held by said support, pressure gauge, means for connecting said pump to said gauge, apressure-accumulator, means for connecting said pump and said gauge to said pressure accumulator, and two control valves, one of said valves being operable to isolate the pressure gauge and the liquid accumulator from the pump and the injector undergoing test and the second valve being operable to isolate the liquid accumulator only from the said pump and the said injector.

11. A machine for testing injectors or nozzles for compression ignition engines, comprising a liquid feed pump, a cam for operating the pump, means for driving the cam at a steady speed of rotation, a support for holding an injector to be tested to expose to view the spray that issues from the injector, means for connecting said pump to the injector held by said support, a case, a top plate thereon, a platform between said top plate and the bottom of the case, said liquid feed pump, said cam and said means for driving the cam being mounted on said platform, said support being mounted on said top plate to locate the injector undergoing test above said top plate, and a receptacle for the reception of spray from the injector, said receptacle being mounted on said top plate with its mouth vertically beneath said support for the injector, a liquid feed tank mounted on said top plate, a pressure gauge and a pressure accumulator mounted on said top plate, a pipe connection between said feed tank and the intake of said pump, a connection be tween the delivery of said pump and said pressure gauge and said pressure accumulator and two control valves the first of said valves being operable to isolate the pressure gauge and the liquid accumulator from the pump and the injector undergoing test and the second valve being operable to isolate the liquid accumulator only from the said pump and the said injector.

12. A machine for testing injectors or nozzles for compression ignition engines, comprising a liquid feed pump, a cam for operating the pump,

means for driving the cam at a steady speed of rotation, a support for holding an injector to be tested to expose to view the spray that issues from the injector, means for connecting said pump to th injector held by said support, a case, a top plate thereon, a platform between said top plate and the bottom of the case-and said liquid I1. feed pump, said cam and saidimeans:foradriving thecam being "mounted ,on :said :platform, said support being amountednnisaiditopaplate -to lo:- cate the injector undergoing test. above, said .top plate, and a receptacle for the reception oispray from the injector, saidieceptacle bein mounted onsaid-top plate with-itsmouth verticallybee neath said support for the injector,- an exhauster, a flow connection between the intake of .saidex hauster and v the interior of; said 1.,rec.ep tac1e, a drive connection between ,said cam drive,- means and said exhausteig, a wast tank mounted on said platform, and :a how connection. between the delivery of sa-idexhauster and the interionof said waste tank, said waste tank having an opening at its top to expose-{the interior of said waste tank to the atmosphere.

13.. -A machine for testing the injectors or nozzles of .compressioneignitionk engines, comprising a liquid feed pump, a cam for operatingthe pump. means for driving the;camat a isteadyspeed of rotation, a support for, holding an; injector to be tested to expose to viewtheispray thatissueswfrom the injector, means for connecting said pump to aninjectorheid by said support; areceptacle for the recent-ion of the spray from an injector undergoing test, an air exhauster and means for drivin'g' same-endure; connection ue ween'th isaid fe Qepitaclei and thezintake .of .said .air exhauster to draw air and spray liquid through said receptacle @141 A machine acco ding t9 c a v it a ii co nection between the receptacle; and theintake oi said air exhauster comprisingvan elbow having the bend thereof 7 arranged lowermost, and v a drain-01f at the bottom of the bend for such spray liquid as accumulates in the bend.

LESUE IiARTRIDGE.

. .1 i l ii i s. a The following references are of record in the file of this patent:

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